--- /dev/null
+# -*- coding: utf-8 -*-
+
+"""
+Authenticator is responsible for authenticating the users,
+create the tokens unscoped and scoped, retrieve the role
+list inside the projects that they are inserted
+"""
+
+__author__ = "Eduardo Sousa <esousa@whitestack.com>"
+__date__ = "$27-jul-2018 23:59:59$"
+
+import cherrypy
+import logging
+from base64 import standard_b64decode
+from copy import deepcopy
+from functools import reduce
+from hashlib import sha256
+from http import HTTPStatus
+from random import choice as random_choice
+from time import time
+
+from authconn import AuthException
+from authconn_keystone import AuthconnKeystone
+from osm_common import dbmongo
+from osm_common import dbmemory
+from osm_common.dbbase import DbException
+
+
+class Authenticator:
+ """
+ This class should hold all the mechanisms for User Authentication and
+ Authorization. Initially it should support Openstack Keystone as a
+ backend through a plugin model where more backends can be added and a
+ RBAC model to manage permissions on operations.
+ """
+
+ def __init__(self):
+ """
+ Authenticator initializer. Setup the initial state of the object,
+ while it waits for the config dictionary and database initialization.
+ """
+ self.backend = None
+ self.config = None
+ self.db = None
+ self.tokens = dict()
+ self.logger = logging.getLogger("nbi.authenticator")
+
+ def start(self, config):
+ """
+ Method to configure the Authenticator object. This method should be called
+ after object creation. It is responsible by initializing the selected backend,
+ as well as the initialization of the database connection.
+
+ :param config: dictionary containing the relevant parameters for this object.
+ """
+ self.config = config
+
+ try:
+ if not self.backend:
+ if config["authentication"]["backend"] == "keystone":
+ self.backend = AuthconnKeystone(self.config["authentication"])
+ elif config["authentication"]["backend"] == "internal":
+ pass
+ else:
+ raise AuthException("Unknown authentication backend: {}"
+ .format(config["authentication"]["backend"]))
+ if not self.db:
+ if config["database"]["driver"] == "mongo":
+ self.db = dbmongo.DbMongo()
+ self.db.db_connect(config["database"])
+ elif config["database"]["driver"] == "memory":
+ self.db = dbmemory.DbMemory()
+ self.db.db_connect(config["database"])
+ else:
+ raise AuthException("Invalid configuration param '{}' at '[database]':'driver'"
+ .format(config["database"]["driver"]))
+ except Exception as e:
+ raise AuthException(str(e))
+
+ def stop(self):
+ try:
+ if self.db:
+ self.db.db_disconnect()
+ except DbException as e:
+ raise AuthException(str(e), http_code=e.http_code)
+
+ def init_db(self, target_version='1.0'):
+ """
+ Check if the database has been initialized. If not, create the required tables
+ and insert the predefined mappings between roles and permissions.
+
+ :param target_version: schema version that should be present in the database.
+ :return: None if OK, exception if error or version is different.
+ """
+ pass
+
+ def authorize(self):
+ token = None
+ user_passwd64 = None
+ try:
+ # 1. Get token Authorization bearer
+ auth = cherrypy.request.headers.get("Authorization")
+ if auth:
+ auth_list = auth.split(" ")
+ if auth_list[0].lower() == "bearer":
+ token = auth_list[-1]
+ elif auth_list[0].lower() == "basic":
+ user_passwd64 = auth_list[-1]
+ if not token:
+ if cherrypy.session.get("Authorization"):
+ # 2. Try using session before request a new token. If not, basic authentication will generate
+ token = cherrypy.session.get("Authorization")
+ if token == "logout":
+ token = None # force Unauthorized response to insert user pasword again
+ elif user_passwd64 and cherrypy.request.config.get("auth.allow_basic_authentication"):
+ # 3. Get new token from user password
+ user = None
+ passwd = None
+ try:
+ user_passwd = standard_b64decode(user_passwd64).decode()
+ user, _, passwd = user_passwd.partition(":")
+ except Exception:
+ pass
+ outdata = self.new_token(None, {"username": user, "password": passwd})
+ token = outdata["id"]
+ cherrypy.session['Authorization'] = token
+ if self.config["authentication"]["backend"] == "internal":
+ return self._internal_authorize(token)
+ else:
+ try:
+ self.backend.validate_token(token)
+ return self.tokens[token]
+ except AuthException:
+ self.del_token(token)
+ raise
+ except AuthException as e:
+ if cherrypy.session.get('Authorization'):
+ del cherrypy.session['Authorization']
+ cherrypy.response.headers["WWW-Authenticate"] = 'Bearer realm="{}"'.format(e)
+ raise AuthException(str(e))
+
+ def new_token(self, session, indata, remote):
+ if self.config["authentication"]["backend"] == "internal":
+ return self._internal_new_token(session, indata, remote)
+ else:
+ if indata.get("username"):
+ token, projects = self.backend.authenticate_with_user_password(
+ indata.get("username"), indata.get("password"))
+ elif session:
+ token, projects = self.backend.authenticate_with_token(
+ session.get("id"), indata.get("project_id"))
+ else:
+ raise AuthException("Provide credentials: username/password or Authorization Bearer token",
+ http_code=HTTPStatus.UNAUTHORIZED)
+
+ if indata.get("project_id"):
+ project_id = indata.get("project_id")
+ if project_id not in projects:
+ raise AuthException("Project {} not allowed for this user".format(project_id),
+ http_code=HTTPStatus.UNAUTHORIZED)
+ else:
+ project_id = projects[0]
+
+ if project_id == "admin":
+ session_admin = True
+ else:
+ session_admin = reduce(lambda x, y: x or (True if y == "admin" else False),
+ projects, False)
+
+ now = time()
+ new_session = {
+ "_id": token,
+ "id": token,
+ "issued_at": now,
+ "expires": now + 3600,
+ "project_id": project_id,
+ "username": indata.get("username") if not session else session.get("username"),
+ "remote_port": remote.port,
+ "admin": session_admin
+ }
+
+ if remote.name:
+ new_session["remote_host"] = remote.name
+ elif remote.ip:
+ new_session["remote_host"] = remote.ip
+
+ self.tokens[token] = new_session
+
+ return deepcopy(new_session)
+
+ def get_token_list(self, session):
+ if self.config["authentication"]["backend"] == "internal":
+ return self._internal_get_token_list(session)
+ else:
+ return [deepcopy(token) for token in self.tokens.values()
+ if token["username"] == session["username"]]
+
+ def get_token(self, session, token):
+ if self.config["authentication"]["backend"] == "internal":
+ return self._internal_get_token(session, token)
+ else:
+ token_value = self.tokens.get(token)
+ if not token_value:
+ raise AuthException("token not found", http_code=HTTPStatus.NOT_FOUND)
+ if token_value["username"] != session["username"] and not session["admin"]:
+ raise AuthException("needed admin privileges", http_code=HTTPStatus.UNAUTHORIZED)
+ return token_value
+
+ def del_token(self, token):
+ if self.config["authentication"]["backend"] == "internal":
+ return self._internal_del_token(token)
+ else:
+ try:
+ self.backend.revoke_token(token)
+ del self.tokens[token]
+ return "token '{}' deleted".format(token)
+ except KeyError:
+ raise AuthException("Token '{}' not found".format(token), http_code=HTTPStatus.NOT_FOUND)
+
+ def _internal_authorize(self, token):
+ try:
+ if not token:
+ raise AuthException("Needed a token or Authorization http header", http_code=HTTPStatus.UNAUTHORIZED)
+ if token not in self.tokens:
+ raise AuthException("Invalid token or Authorization http header", http_code=HTTPStatus.UNAUTHORIZED)
+ session = self.tokens[token]
+ now = time()
+ if session["expires"] < now:
+ del self.tokens[token]
+ raise AuthException("Expired Token or Authorization http header", http_code=HTTPStatus.UNAUTHORIZED)
+ return session
+ except AuthException:
+ if self.config["global"].get("test.user_not_authorized"):
+ return {"id": "fake-token-id-for-test",
+ "project_id": self.config["global"].get("test.project_not_authorized", "admin"),
+ "username": self.config["global"]["test.user_not_authorized"]}
+ else:
+ raise
+
+ def _internal_new_token(self, session, indata, remote):
+ now = time()
+ user_content = None
+
+ # Try using username/password
+ if indata.get("username"):
+ user_rows = self.db.get_list("users", {"username": indata.get("username")})
+ user_content = None
+ if user_rows:
+ user_content = user_rows[0]
+ salt = user_content["_admin"]["salt"]
+ shadow_password = sha256(indata.get("password", "").encode('utf-8') + salt.encode('utf-8')).hexdigest()
+ if shadow_password != user_content["password"]:
+ user_content = None
+ if not user_content:
+ raise AuthException("Invalid username/password", http_code=HTTPStatus.UNAUTHORIZED)
+ elif session:
+ user_rows = self.db.get_list("users", {"username": session["username"]})
+ if user_rows:
+ user_content = user_rows[0]
+ else:
+ raise AuthException("Invalid token", http_code=HTTPStatus.UNAUTHORIZED)
+ else:
+ raise AuthException("Provide credentials: username/password or Authorization Bearer token",
+ http_code=HTTPStatus.UNAUTHORIZED)
+
+ token_id = ''.join(random_choice('abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789')
+ for _ in range(0, 32))
+ if indata.get("project_id"):
+ project_id = indata.get("project_id")
+ if project_id not in user_content["projects"]:
+ raise AuthException("project {} not allowed for this user"
+ .format(project_id), http_code=HTTPStatus.UNAUTHORIZED)
+ else:
+ project_id = user_content["projects"][0]
+ if project_id == "admin":
+ session_admin = True
+ else:
+ project = self.db.get_one("projects", {"_id": project_id})
+ session_admin = project.get("admin", False)
+ new_session = {"issued_at": now, "expires": now + 3600,
+ "_id": token_id, "id": token_id, "project_id": project_id, "username": user_content["username"],
+ "remote_port": remote.port, "admin": session_admin}
+ if remote.name:
+ new_session["remote_host"] = remote.name
+ elif remote.ip:
+ new_session["remote_host"] = remote.ip
+
+ self.tokens[token_id] = new_session
+ return deepcopy(new_session)
+
+ def _internal_get_token_list(self, session):
+ token_list = []
+ for token_id, token_value in self.tokens.items():
+ if token_value["username"] == session["username"]:
+ token_list.append(deepcopy(token_value))
+ return token_list
+
+ def _internal_get_token(self, session, token_id):
+ token_value = self.tokens.get(token_id)
+ if not token_value:
+ raise AuthException("token not found", http_code=HTTPStatus.NOT_FOUND)
+ if token_value["username"] != session["username"] and not session["admin"]:
+ raise AuthException("needed admin privileges", http_code=HTTPStatus.UNAUTHORIZED)
+ return token_value
+
+ def _internal_del_token(self, token_id):
+ try:
+ del self.tokens[token_id]
+ return "token '{}' deleted".format(token_id)
+ except KeyError:
+ raise AuthException("Token '{}' not found".format(token_id), http_code=HTTPStatus.NOT_FOUND)